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We report the 1.8 Å structure of yeast poly(A) polymerase (PAP) trapped in complex with ATP and a five residue poly(A) by mutation of the catalytically required aspartic acid 154 to alanine. The enzyme has undergone significant domain movement and reveals a closed conformation with extensive interactions between the substrates and all three polymerase domains. Both substrates and 31 buried water molecules...
Polyadenylate polymerase (PAP) catalyzes the synthesis of poly(A) tails on the 3′-end of pre-mRNA. PAP is composed of three domains: an N-terminal nucleotide-binding domain (homologous to the palm domain of DNA and RNA polymerases), a middle domain (containing other conserved, catalytically important residues), and a unique C-terminal domain (involved in protein–protein interactions required for 3′-end...
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